Jamelle Bouie: Impeachment hurts, and Trump knows it

President Donald Trump’s almost inevitable acquittal doesn’t mean impeachment wasn’t worthwhile.Trump, and Trump alone, will be the central issue of the coming election — the core concern for most voters. He’s the reason pollsters are predicting high turnout; he’s the reason voters on both sides are deeply engaged and ready to take action. In that environment, impeachment is the loudest, clearest message Democrats could send to the electorate. They don’t